At what angle will the fourth-order maximum occur for a wavelength of 513 nm using a diffraction grating with 10 890 lines per cm?
a. 30°
b. 90°
c. No fourth-order maximum will occur in this case.
d. 1.6°
e. 12.8°
c
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What is "seeing"?
A) a measure of the quality of the telescope's optics B) a measure of the transparency of the scope's objective lens C) a measurement of the sharpness of vision of the astronomer's eyes D) a measurement of the image quality due to air stability E) a measurement of clarity and absence of clouds
Aline and Charlie are arguing as to whether or not it is possible in principle for an elevator to have an acceleration of magnitude greater than
. In the course of their discussion they come up with the statements below. Which one is correct?
A.
reaches , the elevator is in free fall.B.
is not possible.C.
when the cable breaks.D.
if the motor is strong enough.E.
The Mercalli scale was used to measure
a. tornados. b. earthquakes. c. tsunamis. d. hurricanes.
A straight wire carries a current of 40 A in a uniform magnetic field (magnitude = 80 mT). If the force per unit length on this wire is 2.0 N/m, determine the angle between the wire and the magnetic field
a. either 39° or 141° b. either 25° or 155° c. either 70° or 110° d. either 42° or 138° e. either 65° or 115°